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At the market planet of Feltzmodo 12, where every kind of fruit and vegetable is for sale, the Doctor is surprised to find a banana. The banana is a fruit that should not be growing anywhere in the Universe at this time. He takes Amy to the Earth of the future; it has been ravaged by solar storms that have lasted hundreds of years. Norway has become a desert after the solar flares atomised the oceans and boiled the glaciers to steam within minutes.

Protected from the heat, half buried, is the Terran Seed Vault a store for the seed bank of the plant world of Earth. When the Doctor and Army, dressed in heat resistant space suits, arrive, they discover that the vault is being raided by Purzithroan Vagabonds, pirates from the Ambiant Expanse, who are selling the seeds to the highest bidder.

Finding their way undetected to the climate control centre, the Doctor and Amy create holographic projections that with the use of cameras and mic, frighten the Purzithroan Vagabonds and warn them away, back to their ships.